Locomotive fire box



R. J. HIMMELRIGHT.

LOCOVIOTIVE FIREBOX.

APPLicATIoN FLED MAY 4. 191?.

Patented Jan. 3, 1922,

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LOCOMOTIVE FIREBOX.

APPLlcAloN FILED MAY 4, 1911.

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RALEIGH J. EIIIM-IELRIGH'.I, OF NEW YORK, N. Y., ASSIGNOR T0 AMERICAN ARCH COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF DELAWARE.

LOCOMOTIVE FIRE BOX.

To all whom it may cfm'ccrn:

Be it known that I, RALEIGH J HIMMEL- RIGHT, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Locomotive Fire Boxes, of which the following is a specification.

This invention relates to improvements in locomotive iire boxes and has particular reference 'to fire boxes of `the Gaines type, in which the re box is divided into a fire chamber and a combustion chamber by means of a bridge wall extending across the ire box intermediate the iiue sheet andthe ends of the grates, means being provided in said bridge wall for introducing an additional supply of air.

@neef the primary vobjects of my invention is the provision of a Vtire box of this gen" eral type in which better combustion andincrease in general eiiiciency are obtained by introducingthe additional air under automatic control.

'One of the chief objects of the Gaines type of iire box is to obtain veconomy in the consumption of fuel and this has heretofore necessitated' the provision ofmanually controlled mechanism for shutting 0E the additionai air. supply when 4the engine is not working. propose to employ mechanism which automatically cuts off the additional air supply when the engine isnot working, thus eiecting a saving in fuel consumption, said means in addition regulating` the volume of additional air supplied in proportion to the demands of the engine, as working conditions vary, as a-result of which better combustion, economical operation and increase in general eiiiciency are obtained.

accomplish'the foregoing, together with such other objectsas may hereinafter appear, by means of a construction illustrated 'n preferredv form in the accompanying drawings, wherein Figure 1 is a longitudinal section through eines lre box with my improvements ap plied? thereto; Fig. 2 is a top plan ofa. de tail of my invention; Fig. 3 is a section vken along the iine TTT-TH of Fig. 2; and ig. i is a section taken on the line i7 of Fig. 8. eferring now to `iEig. 1, it will be seen fire box comprises the usual iue side ehe-ets 8, back sheet 9, and

` Specification of Letters Patent. Pabntgeqjl Jamo 3', 11922,

Application med May 4; 1917.

Serial No. 166,305.

i crown sheet l0. bridge wallll, wbr-ich divides the fire box into the lire chamber-5 A and combustion chamber B, is carried on the cross bearer 12 supported from the inside of the mud ring 13, such bridge wall extending across the fire box, and being located in advance of the grates 14.' rThe bridge wall is composed of fire brick or other suitable refractory material and is carried up to thecirculation tubes 15 where 65 it cooperates with the rearwardly extending brick arch 16 carried on the tubes. In the bottom of the combustion chamber B is a discharge hopper 17 for the removal of deposit. Extending upwardly through the bridge wall 11 and Yopening rearwardly therefrom beneath the aiz'lare `onetpr more air supply passages or pipesv 18. rThe air supply `pipe is controlled by an automatic damper mechanism indicated as` a whole at. C, such mechanism comprising a bellied or oiisetl casing 19 having an opening 20 in the bottom thereof, such opening 4 being controlled by a damper plate 21 pivotally mounted on the casing as indicated at 22.v The pineal..isipivoted onesti@ sa that the area of t-he portion marked `a is approximately three times the area of the portion marked vb, as a result of which the plate 21 constitutes a diiferential damper which normally is gravity held in closed positionagainst the seats' 23. The opening movement of the damper is limited by the stop'V 24.

rThe operation of the damper is' as follows: when the engine is not working, the normal draft through the grates supplies sutlicient air'for the economical maintenance of the tire and there is no draft or suction through the pipe 1.8,0r at least the draft is not sucient to cause the damper to open. When however the engine is working, owing to the partial vacuum created in the iire chamber, the suction through the upright supply pipe 18 will cause the damper to open because of the unbalanced areas a and @the degree to which the damper opens being dependent entirely upon the degree of suction which in turn is dependent upon the particular work- 18 will be in direct proportion to the varying demands of the engine. Thus, Whether the engine is idle or is working, an' is supplied only in accordance with the demands, as a direct result of which at all times better combustion and more economical consumption of fuel are obtained.

It will of course be understood that my invention is applicable to other types ofire boxes than the specific one shown, my invention being directed to introduction ofthe' i clination of the damperb when fully opened being greater than the angle of rest. I claim 1. A locomotive fire box construction operating under variable forced draft conditions comprising in combination, av supplemental air inlet and 'means' Jfor controlling said inlet comprising a caslng having a por.v

tion of its interlor passage in line with`said inlet and an enlarged portion oiiset with respect to said inlet, a damper, and means for pivoting said 'damper at a point removed from an edge so as to provide unequal areas,

at each side of the pivot line, the greater area being opposite the offset portion and the lesser area being opposite the inlet, said damper being adapted to increase the effecc tive opening through theinlet as the locomo-l tive is worked harder.

2. Awlocomotive fire box construction operating under variable forced draftconditions comprising in combination, a supplemental air inlet and means for controlling said inlet comprising a easing havingv apportion of its interior passage in line with said inlet andan enlarged portion oi'set with respect4 to said inlet, a damper, and means for pivoting said damper at apoint removed from an.edge so as to provide uny i equal areas at each side off'thepivot line, the

greater areal being adapted toswing inwardly toward said inlet and the lesser area t0 swing outwardly away `from the-inlet whereby accumulated deposit may be discharged and air may be admitted,f said damper tending to increase theopening as the locomotive is worked harder.

. In testimony whereof I have. hereunto signed my name.

.RALEIGH J. HIMMELRIGHT. 

